jEdit often gets into a state where drag and drop from jEdit to another application does not work properly.
In this state, if I select some text in jEdit and drag/drop it to another application, then the text is pasted in BOTH the other application and into jEdit. The insertion point in jEdit is not generally near the text that was highlighted and dragged, but is at or near the line where the document was last edited.
Just to be clear, let me say that again. I'm dragging text OUT of jEdit and dropping it into another application, but it is mistakenly also dropped back into the jEdit document.
I"m using jEdit version 4.2pre12, Java 1.5.0_13, under OS-X Leopard. The problem has existed for a long time however, e.g. under Tiger too.